Total cervical lymphatic dissection is suitable for: metastases of facial and neck cancers mostly through the lymphatic tract but not through the bloodstream. The common malignant tumors that can be treated better by removing the primary focus and cervical lymph nodes include thyroid cancer, parotid cancer, submandibular cancer, lip cancer, tongue cancer and subpharyngeal cancer. For squamous epithelial carcinoma of oral organ mucosa or facial epithelium, radiation therapy can be used to control the primary foci, and after the primary foci are controlled, surgery can be performed to deal with the cervical lymphatic drainage area. In some cases, if the efficacy of radiation therapy is not certain, the primary cancer and the whole cervical lymphatic tissue can be considered for resection. Most of the external laryngeal carcinomas are squamous epithelial carcinomas, which can be treated by radiotherapy for the primary foci and surgical resection for the facial and cervical lymphatic tissues. Metastatic carcinoma of the neck with unknown primary foci, with a diameter of <5cm, clear boundaries and no obvious adhesions with surrounding tissues, and with higher differentiation of cancer cells can be surgically excised. Contraindications: 1.Cancer of neck, face, oral cavity and external larynx (subpharyngeal cancer) is in advanced stage. 2.Patients with oral cancer and subcutaneous lymph node metastasis in the neck, indicating that the metastasis of deep cervical lymph nodes has spread to the subcutaneous lymph nodes in the neck, and the efficacy of total cervical lymphatic tissue removal is not good. 3.Nasopharyngeal cancer with extensive metastasis in both sides of the neck, due to its high malignancy, surgical removal of lymphatic tissues in the neck cannot achieve the purpose of control, so radiation therapy is appropriate. 4.When the cancer has invaded into the skull base or has the tendency to be fixed in the deep layer of cervical fascia, surgery can no longer be complete. 5.Distant metastasis occurs, such as subclavian and intra-mediastinal lymph node metastasis. 6.The paralysis of sublingual nerve is a sign of advanced stage, so the effect of surgery should be considered carefully and non-surgical treatment is appropriate. 7.Patients with metastatic carcinoma in the neck without detecting its primary focus, such as metastatic lymph nodes invading the paracranial nerve and near the skull base, lesions in the neck with a diameter of more than 5 cm, and those with adhesions to deep neck tissues are not suitable for cervical lymph node removal.